<template>
  <!-- 搜索页面 -->
  <view>
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none"  />
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="kw !==''">
      <view class="sugg-item" v-for="(item,i) in saerchResults" :key="i" @click="gotoDetail(item.goods_id)">
        <text class="goods-name">{{item.goods_name}}</text>
        <uni-icons type="arrowright" size="16" ></uni-icons>
      </view>
    </view>
    
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="18" @click="clean"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item"  v-for="(item, i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
      
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null ,//延时器timerid
        kw:'',//搜索关键字 
        saerchResults:[] ,//搜索结果
        historyList:[]
      };
    },
    computed: {
      historys() {
        // 注意：由于数组是引用类型，所以不要直接基于原数组调用 reverse 方法，以免修改原数组中元素的顺序
        // 而是应该新建一个内存无关的数组，再进行 reverse 反转
        return [...this.historyList].reverse()
      }
    },
    onLoad() {
      this.historyList=JSON.parse(uni.getStorageSync('kw') || '[]') 
    },
    methods:{
      input(e){
        clearTimeout(this.timer)
        this.timer=setTimeout(()=>{
          this.kw=e
          this.getsaerchList()
        },500)
      },
     async getsaerchList(){
        if(this.kw ==='') {
          this.saerchResults=[]
          return
        }
         // 发起请求，获取搜索建议列表
        const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
        if(res.meta.status !== 200) return uni.$showMsg()
        this.saerchResults=res.message
        // 1. 查询到搜索建议之后，调用 saveSearchHistory() 方法保存搜索关键词
            this.saveSearchHistory()
      },
      gotoDetail(id){
        uni.navigateTo({
          url:'/subkg/goods_detail/goods_detail?goods_id='+id
        })
      },
      saveSearchHistory(){
        // this.historyList.unshift(this.kw)
        const set=new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList=Array.from(set)
        // 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      clean(){
        this.historyList=[]
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subkg/goods_list/goods_list?query='+kw
        })
      }
    }
  }
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list{ //搜索建议
  padding-top: 0 5px;
  .sugg-item{
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #fefefe;
    display: flex;
    justify-content: space-between;
    align-items: center;
    .goods-name{
      white-space: nowrap;
      overflow:hidden;
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}


.history-box{ //搜索历史
padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    border-bottom: 1px solid #fefefe;
    text{
      font-size: 13px;
    }
  }
  .history-list{
    display: flex;
    flex-wrap: wrap;
  }
  .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
}
</style>
